Other: Fix all linter errors

internal/logging/imap_logger.go

@@ -19,7 +19,7 @@ package logging
 
 import "github.com/sirupsen/logrus"
 
-// IMAPLogger implements the writer interface for Gluon IMAP logs
+// IMAPLogger implements the writer interface for Gluon IMAP logs.
 type IMAPLogger struct {
 	l *logrus.Entry
 }

internal/logging/smtp_logger.go

@@ -38,7 +38,7 @@ func (s *SMTPErrorLogger) Println(args ...interface{}) {
 	s.l.Errorln(args...)
 }
 
-// SMTPDebugLogger implements the writer interface for debug SMTP logs
+// SMTPDebugLogger implements the writer interface for debug SMTP logs.
 type SMTPDebugLogger struct {
 	l *logrus.Entry
 }